US 11,807,821 B2
Process for the manufacture of a mineral admixture for use in concrete products by selective sizing and milling of coal ash
Robert L. Smith, Murphy, NC (US)
Assigned to ASH RECOVERY SYSTEMS, INC., Amarillo, TX (US)
Filed by ASH RECOVERY SYSTEMS, INC., Amarillo, TX (US)
Filed on Dec. 30, 2020, as Appl. No. 17/138,127.
Claims priority of provisional application 62/955,971, filed on Dec. 31, 2019.
Prior Publication US 2021/0198587 A1, Jul. 1, 2021
Int. Cl. C10J 3/52 (2006.01); C04B 18/06 (2006.01)
CPC C10J 3/52 (2013.01) [C04B 18/061 (2013.01); C10J 2300/1628 (2013.01)] 22 Claims
 
1. A method of manufacturing a coal ash material for use in concrete products by reducing sulfur concentration of a coal ash, the method comprising:
selectively screening the coal ash based on a predetermined particle size to remove a portion of the coal ash with sulfur concentrations higher than a desired sulfur concentration to yield a screened ash product, particles of the screened ash product being at least as big as the predetermined particle size; and
reducing the size of the particles of the screened ash product to produce the coal ash material meeting fineness requirements set forth in American Society for Testing and Materials (ASTM) specifications, American Association of State Highway and Transportation Officials (AASHTO) specifications, or both the ASTM specifications and the AASHTO specifications for coal ash for use with concrete.